DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 210

• Manufacturer Part Number: DEMO9S08EL32
• Description: BOARD DEMO FOR 9S08 EL MCU
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08EL32

• Contents: Evaluation Board
• Processor To Be Evaluated: MC9S08EL32
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 12 V
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08EL
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08EL32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The SLIC transmit go (TXGO) bit should be 0 for command frames, indicating to the SLIC that data is
coming from the master. The checksum mode control (CHKMOD) bit allows the user to select which
method of checksum calculation is desired for this message frame. The LIN 1.3 checksum does not include
the identifier byte in the calculation, while the SAE version does include this byte. Because the identifier
is already received by the SLIC by this time, the default is to include it in the calculation. If a LIN 1.3
checksum is desired, a 1 in CHKMOD will reset the checksum circuitry to begin calculating the checksum
212
RECEIVE BUFFER OVERRUN
PROCESS ERROR CODE:
BYTE FRAMING ERROR
CHECKSUM-ERROR
RETURN TO IDLE
NO-BUS-ACTIVITY
CLEAR SLCF
EXIT ISR
Figure 12-15. Handling Command Messages (Data Receive)
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
Y
WRITE SLCDLC FOR THIS ID
0n00 0xxx
(TXGO = 0)
(CHKMOD = n)
COMMAND MESSAGE
EXTENDED FRAME
EMPTY RX BUFFER
ERROR CODE
READ SLCSV
CLEAR SLCF
INTERRUPT
PROCESS
EXIT ISR
VALID ID
N
Y
N
?
?
?
N
Y
1. EMPTY RX BUFFER
2. DECREMENT SW BYTE COUNT BY 8
3. CLEAR SLCF
N
INITIALIZE SW BYTE COUNT
WRITE SLCDLC FOR THIS ID
0nxx xxxx
(TXGO = 0)
(CHKMOD = n)
REQUEST MESSAGE
(SW BYTE COUNT <8)
PROCESS
ERROR CODE
LAST FRAME
READ SLCSV
INTERRUPT
EXIT ISR
N
Y
?
?
Y
Freescale Semiconductor
RECEIVE BUFFER OVERRUN
PROCESS ERROR CODE:
BYTE FRAMING ERROR
NO-BUS-ACTIVITY
RETURN TO IDLE
CLEAR SLCF
EXIT ISR